Comments (6)
- It can be racy if you are mixing it with non atomic accesses. The error message also suggests that (note the addr is the same)
- TSAN does typically take longer.... not sure why the loop happens tho.
- Do you have llvm-symbolizer enabled? That should tell where the racy accesses are happening, and you should look into those.
from cs431.
Regarding question 2, taking too much time in testing can be a strong signal that your code can result in deadlock. Even if your code passes other tests with cargo
or cargo_asan
, unlucky scheduling with cargo_tsan
may result in deadlock. Note that our model solution takes at most 1 min for testing with cargo_tsan
, so testing should not take that much long as in your case (>30min).
from cs431.
- Yes, I know that they have the same address, and it says Atomic write, and when I see the backtrace, indeed the first function in the backtrace was an atomic operation. I am confused about this.
- It is version 14. And I executed the following command shown in manual:
sudo ln -s /usr/bin/llvm-symbolizer-14 /usr/bin/llvm-symbolizer
But I don't see helpful messages though
from cs431.
- It can be racy if you are mixing it with non atomic accesses. The error message also suggests that (note the addr is the same)
- TSAN does typically take longer.... not sure why the loop happens tho.
- Do you have llvm-symbolizer enabled? That should tell where the racy accesses are happening, and you should look into those.
this is one of the summaries generated by sanitiser:
SUMMARY: ThreadSanitizer: data race /home/ubuntu/.rustup/toolchains/nightly-2024-03-13-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/sync/atomic.rs:3361:23 in core::sync::atomic::atomic_sub::h5c8653b27dead1c1
Is this how it is supposed to print after llvm-symbolizer is enabled?
from cs431.
Yes that looks correct. In terms of the data race, what I meant is that from the summary you posted:
WARNING: ThreadSanitizer: data race (pid=1183058)
Atomic write of size 8 at 0x720c00005a58 by thread T35:
Previous write of size 8 at 0x720c00005a58 by thread T32:
The two writes by T32 and T35 are racing, so it's probably the case that the write by T32 is non-atomic.
from cs431.
Thanks! This helped to debug it!
from cs431.
Related Issues (20)
- [Question] Unable to start the workspace on Coder HOT 1
- [Question] I get VALID?=timeout with full score log HOT 4
- [Lecture] Suggestion on teaching promising semantics HOT 1
- Optional Q&A session on June 5th (Wed)
- [Question] Understanding of access hazard & ABA hazard HOT 1
- Server rebooting scheduled (Jun 5, Wed, 10pm~) HOT 1
- [Question] zip is not installed on server HOT 2
- gg.kaist.ac.kr down for preparing for the final exam HOT 1
- [Question] find_harris_herlihy_shavit relaxed load for tag HOT 6
- [Question] Timeout on growable_array stress_concurrent with cargo_asan HOT 2
- [Question] How to get previous node of bucket sentinel? HOT 8
- [Question] Hazard Pointers: is it safe to protect a pointer to invalid memory? HOT 5
- [Question] Code lines for maintaining the invariants of stack/queue HOT 1
- [Question] About the problem of 2022 Fall HOT 2
- [Question] ordering in stack push for maintaining invariant HOT 1
- Final claim session on June 17th (Mon) HOT 4
- [Question] HW 7 reason for having atomicUsize type in hazard field HOT 2
- [Question] [HW7] Failed Basic Tests in hazard.rs HOT 3
- [Question] HW7 Dropping the Hazard Bag HOT 3
- [Question] Partial Points on HW7 HOT 1
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from cs431.